Sand Dollar Là Con Gì

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Phylum Echinodermata > Class Echinodea > Order Clypeasteroida
Cake sand dollar Arachnoides placenta Family Clypeasteridae updated Mar 2020 Where seen? This rather featureless disk-shaped animal is commonly seen on some of our Northern shores, on sand bars and sandy areas near seagrasses. Often found in groups of large numbers of individuals, half buried in the sand. Sometimes also seen on the Southern shores.

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Bạn đang xem: Sand dollar là con gì Features: Body diameter 6-8cm. Seen in various sizes, some may be tiny (about the size of a 10cent coin). It has no slots in the body. While the star-shaped petalloid is not very obvious in living specimens, they are clearly seen in the test of a dead sand dollar. The colours of a living sand dollar may range from deep reddish-purple, to brownish-purple or beige.

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Mouth on the underside.

Dead or alive? Sand dollars may appear dead, but they are very much alive. A living sand dollar is covered with fine spines and appears velvety. The skeleton (test) of a dead one is smooth, without any spines, and the details of skeleton can be seen more clearly. The skeleton is fragile and will shatter at the slightest pressure.

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Living sand dollars, not moving under sand.Lazarus Island, Jun 09
What eats sand dollars? Some snails such as the Grey bonnet are believed to feed on sand dollars. A Knobbly sea star was seen with its stomach stuck to a sand dollar. A Haddon”s carpet anemone was also seen in the process of engulfing one. Kok Sheng also shared a video clip (below) of hermit crabs arguing over a sand dollar. Tiny parasitic snails are sometimes seen on them too.

Chuyên mục: Kiến Thức

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